Coiled tubing drum hydraulic control system, method and coiled tubing service truck

Abstract

The present invention provides a coiled tubing drum hydraulic control system, a method and a coiled tubing work vehicle, which relate to the technical field of oil and gas equipment. The tubing drum hydraulic control system includes a speed reducer, a control valve device and a drum motor. The drum motor is hydraulically connected to the speed reducer and the control valve device respectively; the speed reducer is used to receive a signal for releasing the brake, and the control valve device is used to receive a signal for releasing the brake and a drum action signal. After the control valve device receives the signal for releasing the brake and the drum action signal at the same time, the control valve device opens to enable the drum motor to drive the speed reducer to act. Only when the control valve device receives at the same time that the brake control valve is in the second working position to release the brake of the speed reducer by the speed reducer brake, and then adjusts the working position of the drum main control valve can the driving of the drum motor be realized, ensuring the safety of the operation.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas equipment, and in particular, to a coiled tubing drum hydraulic control system, a method, and a coiled tubing work vehicle. Background Art

[0002] The coiled tubing work vehicle is a special machine widely used in the petroleum industry and is known as the "universal working machine". The tubing drum is an important component of the coiled tubing work vehicle, which coils and uncoils the expensive tubing.

[0003] At present, the brake of the drum reducer and the power control of the motor are independent control modules. There is a risk of misoperation of supplying power to the drum motor while the brake is not released, and there may also be accidents in the operation of the tubing drum due to unskilled operation, resulting in safety risks and damage to equipment. Summary of the Invention

[0004] The present invention aims to solve at least one aspect of the above technical problems.

[0005] To solve the above problems, the present invention provides a coiled tubing drum hydraulic control system, including a reducer, a control valve device, and a drum motor. The drum motor is hydraulically connected to the reducer and the control valve device respectively.

[0006] The reducer is used to receive the brake release signal, and the control valve device is used to receive the brake release signal and the drum action signal. After the control valve device receives the brake release signal and the drum action signal simultaneously, the control valve device opens to enable the drum motor to drive the reducer to act.

[0007] Further, the system further includes a brake control valve. The control valve device includes a drum main control valve and a drum control pilot valve. The reducer includes a reducer body and a reducer brake connected to each other.

[0008] The middle position of the drum main control valve is in a disconnected state, and other positions of the drum main control valve are used to drive the drum motor to act.

[0009] The reducer body is connected to the brake control valve through the reducer brake. The first position of the brake control valve is the brake position, and the second position of the brake control valve is used to send the brake release signal to the reducer brake and the drum control pilot valve respectively.

[0010] The middle position of the drum control pilot valve is in a disconnected state, and other positions of the drum control pilot valve are used to send the drum action signal to the drum main control valve.

[0011] When the drum control pilot valve receives the brake release signal and the drum main control valve receives the drum operation signal, the drum main control valve is in other working positions to make the drum motor operate.

[0012] Further, it further includes a first oil circuit, a second oil circuit, a third oil circuit, a fourth oil circuit, a pilot pressure reducing valve, a fifth oil circuit, a sixth oil circuit and a seventh oil circuit. The drum motor has an A port and a B port. The first oil port of the drum main control valve is connected to the first oil circuit, the second oil port of the drum main control valve is connected to the second oil circuit, the third oil port of the drum main control valve is connected to the A port, and the fourth oil port of the drum main control valve is connected to the B port; the first oil port of the brake control valve is connected to the first oil circuit through the third oil circuit, the second oil port of the brake control valve is connected to the reducer brake through the fourth oil circuit. The first working position of the brake control valve is used to disconnect the third oil circuit and the second oil circuit, and the second working position of the brake control valve is used to connect the third oil circuit and the fourth oil circuit; the pilot pressure reducing valve is arranged on the third oil circuit. The first oil port of the drum control pilot valve is connected to the second oil port of the brake control valve through the fifth oil circuit, the second oil port of the drum control pilot valve is connected to one end of the drum main control valve through the sixth oil circuit, and the third oil port of the drum control pilot valve is connected to the other end of the drum main control valve through the seventh oil circuit.

[0013] Further, the system further includes an eighth oil circuit and an oil tank. One end of the eighth oil circuit is connected to the fourth oil port of the drum control pilot valve, and the other end of the eighth oil circuit is connected to the oil tank.

[0014] Further, fixed orifices are respectively arranged on the sixth oil circuit and the seventh oil circuit.

[0015] Further, the system further includes a safety valve, and the safety valve is connected in parallel with the drum motor.

[0016] Further, the system further includes a make-up oil pressure source and a make-up oil back-pressure valve. The make-up oil pressure source is used to supply oil to the second oil circuit, and the make-up oil back-pressure valve is arranged on the second oil circuit.

[0017] Further, the system further includes a main relief valve assembly, and the main relief valve assembly is arranged on the first oil circuit.

[0018] Compared with the prior art, a coiled tubing drum hydraulic control system provided by the present invention has, but is not limited to, the following beneficial effects:

[0019] After the speed reducer receives the brake release signal, the speed reducer releases the brake state (the normal state of the speed reducer is the brake state). When the speed reducer receives the brake release signal, the control valve device can also receive this brake release state. After the control valve device receives the brake release state and the drum action signal, the drum motor can be actuated. Then, the actuated drum motor drives the speed reducer in the brake released state to work. Finally, the speed reducer drives the drum to rotate to realize the conveyance or winding of the coiled tubing, ensuring that the drum motor can only act after the speed reducer releases the brake state, thus guaranteeing the safety of the operation.

[0020] The present invention also provides a coiled tubing operation vehicle, including the coiled tubing drum hydraulic control system as described above.

[0021] Since the technical improvements and beneficial effects of the coiled tubing operation vehicle are the same as those of the coiled tubing drum hydraulic control system, the coiled tubing operation vehicle will not be elaborated herein.

[0022] The present invention also provides a coiled tubing drum hydraulic control method. The coiled tubing drum hydraulic control method is based on the coiled tubing drum hydraulic control system as described above. The coiled tubing drum hydraulic control method includes:

[0023] When the speed reducer receives the brake release signal, the speed reducer releases the brake state;

[0024] When the control valve device receives both the brake release signal and the drum action signal simultaneously, the control valve device opens to enable the drum motor to drive the speed reducer to act;

[0025] When the control valve device receives one of the brake release signal and the drum action signal, the drum motor stops acting.

[0026] Since the technical improvements and beneficial effects of the coiled tubing drum hydraulic control method are the same as those of the coiled tubing drum hydraulic control system, the coiled tubing drum hydraulic control method will not be elaborated herein. Description of the Drawings

[0027] Figure 1 It is a schematic structural diagram of the coiled tubing drum hydraulic control system according to an embodiment of the present invention;

[0028] Figure 2 It is a hydraulic schematic diagram of the coiled tubing drum hydraulic control system according to an embodiment of the present invention;

[0029] Figure 3 It is a flowchart of the coiled tubing drum hydraulic control method according to an embodiment of the present invention.

[0030] Description of the Reference Numerals:

[0031] 1. First oil circuit; 2. Second oil circuit; 3. Third oil circuit; 4. Fourth oil circuit; 5. Fifth oil circuit; 6. Sixth oil circuit; 7. Seventh oil circuit; 8. Eighth oil circuit; 9. Drum motor; 91. Port A; 92. Port B; 10. Drum main control valve; 11. Brake control valve; 12. Reducer brake; 13. Drum control pilot valve; 14. Pilot pressure reducing valve; 15. Fuel tank; 16. Fixed orifice; 17. Safety valve; 18. Make-up oil pressure source; 19. Make-up oil back pressure valve; 21. Main relief valve; 22. Pilot relief valve. Detailed implementation manners

[0032] To make the above objects, features and advantages of the present invention more obvious and understandable, the following detailed description of specific embodiments of the present invention is provided in conjunction with the accompanying drawings.

[0033] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0034] Moreover, in the accompanying drawings, the Y-axis represents the horizontal direction, that is, the left and right positions, and the positive direction of the Y-axis (that is, the arrow direction of the Y-axis) represents left, and the negative direction of the Y-axis (that is, the direction opposite to the positive direction of the Y-axis) represents right; the Z-axis in the accompanying drawings represents the vertical direction, that is, the up and down positions, and the positive direction of the Z-axis (that is, the arrow direction of the Z-axis) represents up, and the negative direction of the Z-axis (that is, the direction opposite to the positive direction of the Z-axis) represents down.

[0035] At the same time, it should be noted that the meanings represented by the foregoing Y-axis and Z-axis are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0036] See Figure 1 and Figure 3 , Figure 1 In, M refers to the brake release signal, and N refers to the drum operation signal. A coiled tubing drum hydraulic control system according to an embodiment of the present invention includes a reducer, a control valve device, and a drum motor 9, and the drum motor 9 is hydraulically connected to the reducer and the control valve device respectively;

[0037] The speed reducer is used to receive the brake release signal, and the control valve device is used to receive the brake release signal and the drum action signal. After the control valve device receives the brake release signal and the drum action signal simultaneously, the control valve device opens to enable the drum motor 9 to drive the speed reducer to act.

[0038] In this embodiment, after the speed reducer receives the brake release signal, the speed reducer releases the brake state (the speed reducer is in the brake state under normal conditions). At the same time when the speed reducer receives the brake release signal, the control valve device can also receive this brake release state. Only after the control valve device receives the brake release state and the drum action signal can the drum motor 9 act. Then, the operating drum motor 9 drives the speed reducer in the released brake state to work. Finally, the speed reducer drives the drum to rotate to realize the conveyance or winding of the coiled tubing, ensuring that the drum motor can only act after the speed reducer releases the brake state, thus ensuring the safety of the operation.

[0039] Optionally, referring to Figure 2 , the system further includes a brake control valve 11. The control valve device includes a drum main control valve 10 and a drum control pilot valve 13. The speed reducer includes a speed reducer body and a speed reducer brake 12 which are connected to each other;

[0040] The middle position of the drum main control valve 10 is in a disconnected state, and other positions of the drum main control valve 10 are used to drive the drum motor 9 to act;

[0041] The speed reducer body is connected to the brake control valve 11 through the speed reducer brake. The first position of the brake control valve 11 is the brake position, and the second position of the brake control valve 11 is used to send the brake release signal to the speed reducer brake 12 and the drum control pilot valve 13 respectively;

[0042] The middle position of the drum control pilot valve 13 is in a disconnected state, and other positions of the drum control pilot valve 13 are used to send the drum action signal to the drum main control valve 10;

[0043] When the drum control pilot valve 13 receives the brake release signal and the drum main control valve 10 receives the drum action signal, the drum main control valve 10 is in other positions to enable the drum motor 9 to act.

[0044] Here, the brake of the speed reducer means that the speed reducer body is braked by the speed reducer brake 12, and the brake release signal is provided by the brake control valve 11. Specifically, when the brake control valve 11 is in the second working position (upper position), a brake release signal is generated and received by the speed reducer brake, and the speed reducer brake executes the brake release signal, so that the speed reducer body is in the brake release state. When the brake control valve is in the first working position (lower position), the speed reducer brake 12 does not receive the brake release signal, and the speed reducer brake performs a braking action on the speed reducer body. After the brake control valve 11 generates a brake release signal in the second working position, the drum control pilot valve 13 also receives the brake release signal. Only then can the drum control pilot valve 13 be in other working positions to generate a drum action signal and send it to the drum main control valve 10. After the drum main control valve 10 executes the drum action signal, it is in other working positions, and finally the drum motor 9 operates.

[0045] Optionally, referring to Figure 2 , it further includes a first oil circuit 1, a second oil circuit 2, a third oil circuit 3, a fourth oil circuit 4, a pilot pressure reducing valve 14, a fifth oil circuit 5, a sixth oil circuit 6 and a seventh oil circuit 7. The drum motor 9 has an A port 91 and a B port 92. The first oil port of the drum main control valve 10 is connected to the first oil circuit 1, the second oil port of the drum main control valve 10 is connected to the second oil circuit 2, the third oil port of the drum main control valve 10 is connected to the A port 91, and the fourth oil port of the drum main control valve 10 is connected to the B port 92. The first oil port of the brake control valve 11 is connected to the first oil circuit 1 through the third oil circuit 3, the second oil port of the brake control valve 11 is connected to the speed reducer brake 12 through the fourth oil circuit 4. The first working position of the brake control valve 11 is used to disconnect the third oil circuit 3 and the second oil circuit 2, and the second working position of the brake control valve 11 is used to connect the third oil circuit 3 and the fourth oil circuit 4. The pilot pressure reducing valve 14 is arranged in the third oil circuit 3. The first oil port of the drum control pilot valve 13 is connected to the second oil port of the brake control valve 11 through the fifth oil circuit 5. The second oil port of the drum control pilot valve 13 is connected to one end of the drum main control valve 10 through the sixth oil circuit, and the third oil port of the drum control pilot valve 13 is connected to the other end of the drum main control valve 10 through the seventh oil circuit.

[0046] Here, let the upper oil port of the drum motor 9 be port A91, and the lower oil port of the drum motor 9 be port B92. It can be understood that the drum main control valve 10 has at least three positions. For example, the drum main control valve 10 is a three-position four-way directional control valve. When the brake control valve 11 is in the second position (upper position), if the drum main control valve 10 is in the middle position, neither the first oil circuit 1 nor the second oil circuit 2 is connected to the drum motor 9; if the drum main control valve 10 is in the upper position, its first oil port is connected to the third oil port, and the second oil port is connected to the fourth oil port. Further, the first oil circuit 1 is connected to port A91 of the drum motor 9, and at the same time, port B92 of the drum motor 9 is connected to the second oil circuit 2. At this time, the second oil circuit 2 can be connected to the fuel tank 15 as a return oil circuit, and the drum motor 9 rotates forward at this time; if the drum main control valve 10 is in the lower position, the first oil port of the drum main control valve 10 is connected to the fourth oil port, and the second oil port is connected to the third oil port. Further, the first oil circuit 1 is connected to port B92 of the drum motor 9, and the second oil circuit 2 is connected to port A91 of the drum motor 9. At this time, oil enters from port B and exits from port A, and the second oil circuit 2 still serves as the return oil circuit, and the drum motor 9 rotates in reverse. Among them, the upper position and the lower position of the drum main control valve 10 are the other positions of the drum main control valve 10 mentioned above. The first position (lower position) of the brake control valve 11 is used to disconnect the third oil circuit 3 and the fourth oil circuit 4, and the second position (upper position) of the brake control valve 11 is used to connect the third oil circuit 3 and the fourth oil circuit 4. Here, the brake control valve 11 is a manual valve, and its first position and second position are switched manually.

[0047] Here, the drum main control valve is a three-position four-way hydraulically controlled directional control valve, and the drum control pilot valve 13 is a three-position four-way manual directional control valve. The oil diverted from the first oil circuit 1 reduces the pressure level to the pilot level through the pilot pressure reducing valve 14. After that, when the drum motor 9 needs to work, the brake control valve 11 is manually switched to the upper position, and the oil reduced to the pilot level enters the fifth oil circuit 5 through the brake control valve 11; when the drum control pilot valve 13 is manually switched to the upper position, the oil in the fifth oil circuit 5 acts on the bottom end of the drum main control valve 10 through the seventh oil circuit 7, causing the drum main control valve 10 to work in the lower position. At this time, the oil in the first oil circuit 1 enters port B92 of the drum motor 9, and the drum motor 9 rotates in reverse; when the drum control pilot valve 13 is manually switched to the lower position, the oil in the fifth oil circuit 5 acts on the top end of the drum main control valve 10 through the sixth oil circuit 6, causing the drum main control valve 10 to work in the upper position. At this time, the oil in the first oil circuit 1 enters port A91 of the drum motor 9, and the drum motor 9 rotates forward.

[0048] Thus, the drum control pilot valve 13 is in series with the brake control valve 11. When the drum control pilot valve 13 switches to the upper or lower position, only when the brake control valve 11 is in the second working position (brake contact position), the oil in the pilot stage can act on the reducer brake 12 to make the reducer brake 12 contact the brake of the reducer. At the same time, the oil in the pilot stage can act on the upper or lower end of the drum main control valve 10 to make the drum main control valve 10 in the working position where it can supply oil to the drum motor 9, ensuring that when the coiled tubing drum performs a braking action, the drive motor will not be supplied with oil and act, thus ensuring the operation safety.

[0049] Among them, the reducer brake 12 receiving the brake release signal means that the reducer brake 12 is subjected to the oil pressure and flow rate via the brake control valve 11 and the fourth oil path 4; the drum control pilot valve 13 receiving the brake release signal means that the drum control pilot valve 13 is subjected to the oil pressure and flow rate via the brake control valve 11 and the fifth oil path; the drum main control valve 10 receiving the drum action signal means that the upper end of the drum main control valve 10 is subjected to the oil pressure and flow rate via the drum control pilot valve 13 and the seventh oil path 7, or means that the lower end of the drum main control valve 10 is subjected to the oil pressure and flow rate via the drum control pilot valve 13 and the sixth oil path 6.

[0050] Optionally, referring to Figure 2 , the coiled tubing drum hydraulic control system further includes an eighth oil path 8 and a fuel tank 15. One end of the eighth oil path 8 is connected to the fourth oil port of the drum control pilot valve 13, and the other end of the eighth oil path 8 is connected to the fuel tank 15.

[0051] Here, as before, when the drum control pilot valve 13 is manually switched to the lower position, the oil in the fifth oil path 5 acts on the top of the drum main control valve 10 by the sixth oil path 6, making the drum main control valve 10 work in the upper position. At this time, part of the oil in the seventh oil path 7 can be drained by the drum control pilot valve 13 and then enter the fuel tank 15 through the eighth oil path 8 to provide functions such as oil storage, heat dissipation, and sediment impurity precipitation for the hydraulic system.

[0052] Optionally, referring to Figure 2 , fixed orifices 16 are respectively arranged on the sixth oil path 6 and the seventh oil path 7.

[0053] Here, through the setting of the fixed orifices 16, the hydraulic shock caused by the drum control pilot valve 13 to control the drum main control valve 10 can be reduced, and the working stability can be enhanced.

[0054] Optionally, referring to Figure 2 , the coiled tubing drum hydraulic control system further includes a safety valve 17, and the safety valve 17 is in parallel with the drum motor 9.

[0055] Here, the safety valve 17 is specifically a two-way overflow valve, which protects the hydraulic system from overload and damage to the tubing reel and the hydraulic system.

[0056] Optionally, referring to Figure 2 , the coiled tubing reel hydraulic control system further includes a make-up pressure source 18 and a make-up back-pressure valve 19. The make-up pressure source 18 is used to supply oil to the second oil circuit 2, and the make-up back-pressure valve 19 is disposed on the second oil circuit 2.

[0057] Here, when the drum motor 9 rotates forward, the tubing reel works, for example, controlling the working state of the coiled tubing to be the out-of-well state. However, there is a situation where the drum motor 9 is reverse-driven by other equipment (such as an injector head). At this time, to prevent the B port of the drum motor 9 from sucking air, the make-up pressure source 18 can supply oil to its B port, and the make-up back-pressure valve 19 controls the make-up back pressure.

[0058] Optionally, referring to Figure 2 , the coiled tubing reel hydraulic control system further includes a main overflow valve assembly, and the main overflow valve assembly is disposed on the first oil circuit 1.

[0059] Here, when the drum motor 9 is not reverse-driven by other equipment (such as an injector head), the driving pressure of the rolling motor can be adjusted through the main overflow valve assembly.

[0060] Optionally, referring to Figure 2 , the main overflow valve assembly includes a main overflow valve 21 and a pilot overflow valve 22. The pilot overflow valve 22 is connected to the first oil circuit 1 through the main overflow valve 21.

[0061] Here, the pressure of the main overflow valve 21 can be adjusted by remotely adjusting the pilot overflow valve 22, which is more convenient and labor-saving.

[0062] A coiled tubing operation vehicle according to another embodiment of the present invention includes the coiled tubing reel hydraulic control system as described above.

[0063] Since the technical improvements and beneficial effects of the coiled tubing operation vehicle are the same as those of the coiled tubing reel hydraulic control system, the coiled tubing operation vehicle will not be described in detail herein.

[0064] Referring to Figure 3 , a coiled tubing reel hydraulic control method according to another embodiment of the present invention, the coiled tubing reel hydraulic control method is based on the coiled tubing reel hydraulic control system as described above, and the coiled tubing reel hydraulic control method includes:

[0065] When the reducer receives the signal to release the brake, the reducer releases the brake state;

[0066] When the control valve device receives both the brake release signal and the drum operation signal simultaneously, the control valve device opens to enable the drum motor to drive the speed reducer to operate;

[0067] When the control valve device receives one of the brake release signal and the drum operation signal, the drum motor stops operating.

[0068] Since the technical improvements and beneficial effects of the coiled tubing drum hydraulic control method are the same as those of the coiled tubing drum hydraulic control system, the coiled tubing drum hydraulic control method will not be elaborated herein.

[0069] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features.

[0070] Although the present invention is disclosed as above, the scope of protection of the present invention is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will all fall within the scope of protection of the present invention.

Claims

1. A coiled tubing drum hydraulic control system, characterized in that, It includes a speed reducer, a control valve device, and a drum motor, and the drum motor is hydraulically connected to the speed reducer and the control valve device respectively; The speed reducer is used to receive a brake release signal, and the control valve device is used to receive the brake release signal and a drum action signal. After the control valve device receives the brake release signal and the drum action signal simultaneously, the control valve device opens to enable the drum motor to drive the speed reducer to act; It further includes a brake control valve. The control valve device includes a drum main control valve and a drum control pilot valve, and the speed reducer includes a speed reducer body and a speed reducer brake connected to each other; The neutral position of the drum main control valve is in a disconnected state, and other working positions of the drum main control valve are used to drive the drum motor to act; The speed reducer body is connected to the brake control valve through the speed reducer brake. The first working position of the brake control valve is a braking working position, and the second working position of the brake control valve is used to send the brake release signal to the speed reducer brake and the drum control pilot valve respectively; The neutral position of the drum control pilot valve is in a disconnected state, and other working positions of the drum control pilot valve are used to send the drum action signal to the drum main control valve; After the drum control pilot valve receives the brake release signal and the drum main control valve receives the drum action signal, the drum main control valve is in other working positions to enable the drum motor to act.

2. The coiled tubing drum hydraulic control system according to claim 1, wherein, It further includes a first oil circuit, a second oil circuit, a third oil circuit, a fourth oil circuit, a pilot pressure reducing valve, a fifth oil circuit, a sixth oil circuit, and a seventh oil circuit. The drum motor has an A port and a B port. The first oil port of the drum main control valve is connected to the first oil circuit, the second oil port of the drum main control valve is connected to the second oil circuit, the third oil port of the drum main control valve is connected to the A port, and the fourth oil port of the drum main control valve is connected to the B port; The first oil port of the brake control valve is connected to the first oil circuit through the third oil circuit, the second oil port of the brake control valve is connected to the speed reducer brake through the fourth oil circuit. The first working position of the brake control valve is used to disconnect the third oil circuit and the second oil circuit, and the second working position of the brake control valve is used to connect the third oil circuit and the fourth oil circuit; The pilot pressure reducing valve is arranged in the third oil circuit. The first oil port of the drum control pilot valve is connected to the second oil port of the brake control valve through the fifth oil circuit, the second oil port of the drum control pilot valve is connected to one end of the drum main control valve through the sixth oil circuit, and the third oil port of the drum control pilot valve is connected to the other end of the drum main control valve through the seventh oil circuit.

3. The coiled tubing drum hydraulic control system according to claim 2, wherein, It further includes an eighth oil circuit and an oil tank. One end of the eighth oil circuit is connected to the fourth oil port of the drum control pilot valve, and the other end of the eighth oil circuit is connected to the oil tank.

4. The coiled tubing reel hydraulic control system according to claim 2, wherein Fixed orifices are respectively arranged on the sixth oil circuit and the seventh oil circuit.

5. The coiled tubing reel hydraulic control system according to claim 2, wherein, It further includes a safety valve, and the safety valve is connected in parallel with the drum motor.

6. The coiled tubing drum hydraulic control system according to claim 2, wherein, It further includes an oil replenishing pressure source and an oil replenishing backpressure valve. The oil replenishing pressure source is used to replenish oil to the second oil circuit, and the oil replenishing backpressure valve is arranged on the second oil circuit.

7. The coiled tubing reel hydraulic control system according to claim 2, wherein It further includes a main relief valve assembly, and the main relief valve assembly is arranged on the first oil circuit.

8. A coiled tubing operation vehicle, characterized in that, It includes a coiled tubing drum hydraulic control system according to any one of claims 1 to 7.

9. A hydraulic control method for a coiled tubing reel, characterized in that, The coiled tubing drum hydraulic control method is based on the coiled tubing drum hydraulic control system according to any one of claims 1 to 7, and the coiled tubing drum hydraulic control method includes: When the speed reducer receives a brake release signal, the speed reducer releases the brake state; When the control valve device receives both the brake release signal and the drum action signal at the same time, the control valve device opens to enable the drum motor to drive the speed reducer to act; When the control valve device receives one of the brake release signal and the drum action signal, the drum motor stops acting; After the drum control pilot valve receives the brake release signal and the drum main control valve receives the drum action signal, the drum main control valve is in other working positions to enable the drum motor to act.

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